Makes no sense at all... I'd be wary giving any weight to one...

Makes no sense at all... I'd be wary giving any weight to one shipment (quality?). Ti-sand prices are exponentially proportional to TiO2 content, as per this ILU chart

Sulphate ilmenite is typically around 50% TiO2 and Chloride ilm is typically high 50's (Coburn >60% from memory). Straight-up, Coburn chloride Ilm should be 20% higher priced than typical sulphate ilm on the basis it has 20% higher TiO2 units each tonne. Then add in the 'quality feed multiplier' and >60% TiO2 chloride ilm should be priced maybe 30% higher than sulphate... unless the TiO2 market dynamics have flipped on their head. The opposite should be true moving forward as higher premiums are priced in to 'clean, low-CO2' TiO2 feedstocks.